>>42509516I can pull a couple resources together.
https://victoryroadvgc.com/pokemon-sword-shield-rental-vgc-teams/ These teams are premade to rent out for online, and each one has different playstyles for online.
As dumb as it sounds, the Pikachu team is actually pretty strong with the gmax move that paralyzes both opponents if it connects. Just remember, you can't expect to just immediately win by using these teams. He will need to get some ideas of strategy, but I think he can pick up on that.
As well, try directing him towards some VGC content videos to see just how some things work together.
Wolfe Glick has a lot of useful information about VGC by being a consistent Top 4 and previous world champion.
https://youtu.be/t-mm3Kuh7ow I don't have the massive knowledge that people like Wolfe have learned over the years, but I do know that those links contain some very good information behind them.